初学，欢迎指正
Topic sourcedef trim(t):
if not isinstance(t, (str)):
raise TypeError('必须为字符串')
while t[0] == ' ':
t = t[1:]
while t[-1] == ' ':
t = t[:-1]
return t
- 1
def trim(t):
if not isinstance(t, (str)):
raise TypeError('必须为字符串')
while t[0] == ' ':
t = t[1:]
while t[-1] == ' ':
t = t[:-1]
return t
Ellen
def trim(s):
while s[0] == ‘ ’:
s = s[1:]
while s[-1] == ‘ ’:
s = s[:-2]
return s